在运行脚本时，打开了模拟器并安装了应用程序。但是它显示以下错误。有什么想法吗？
org.openqa.selenium.NoSuchSessionException: A session is either terminated or not started
Build info: version: '3.12.0', revision: '7c6e0b3', time: '2018-05-08T14:04:26.12Z'
System info: host: '01HW1395787', ip: '10.148.29.65', os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '10.14.5', java.version: '1.8.0_211'
Driver info: com.macys.appium.AndroidTouchDriver